TS_616_08 PW8000DPA ST (S2) User Manual 21/4/22
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3: Installation Planning
3.4
Battery configuration
The UPS battery comprises a number of battery blocks (typically between 40-50 VRLA 12V blocks) connected in series to
form a battery ‘string.’ The string voltage is determined by the number of battery blocks contained in the string and the
string capacity is determined by the capacity of the individual battery blocks (e.g. 7 Ahr). The string capacity can be
increased by connecting two or mores strings in parallel.
The required battery string characteristics (voltage and capacity) will be calculated at the UPS system design stage, taking
into account UPS load demand and required autonomy time, and once these are known the composition of the battery
strings can be designed for a chosen battery type.
As stated above, the batteries will be installed and connected by a Kohler Uninterruptible Power Ltd approved
commissioning engineer. However, where external batteries are required (ST80, ST-120, ST-200) the customer’s should
be aware of the external battery cabling requirements as it is the customer’s responsibility to provide appropriate
containment for the DC power cables between the UPS cabinet and battery cabinet so the customer – e.g. cable trays or
trunking.
3.4.1 Common / Individual battery cabling
Figure 3.12 Battery connections (ST-80 cabinet shown)
IMPORTANT NOTE
High voltage battery strings can be extremely dangerous and should not be installed by the
customer’s installation team. The batteries must be fitted and connected to the UPS by an Kohler
Uninterruptible Power Ltd service engineer.
CO M M O N BATTERY
To E
xternal B
attery Cabinet
To UPS B
attery Isol
ator
U
P
S
M
od
ul
e
3
+
U
P
S
M
od
ul
e
2
+
U
P
S
M
od
ul
e
1
+
U
P
S
M
od
ul
e
4
+
U
P
S
M
od
ul
e
3
N
U
P
S
M
od
ul
e
2
N
U
P
S
M
od
ul
e
1
N
U
P
S
M
od
ul
e
4
N
U
P
S
M
odul
e
3
U
P
S
M
odul
e
2
U
P
S
M
odul
e
1
U
P
S
M
odul
e
4
St
ri
ng
2
+
St
ri
ng
3
+
St
ri
ng
4
+
St
ri
ng
1
+
PE
1L1
2L1
St
ri
ng
2
N
St
ri
ng
3
N
St
ri
ng
4
N
St
ri
ng
1
N
St
ri
ng
2
St
ri
ng
3
St
ri
ng
4
St
ri
ng
1
INDIVID
UAL BATTERIES
To E
xternal B
attery Cabinet
To UPS B
attery Isol
ator
U
P
S
M
od
ul
e
3
+
U
P
S
M
od
ul
e
2
+
U
P
S
M
od
ul
e
1
+
U
P
S
M
od
ul
e
4
+
U
P
S
M
od
ul
e
3
N
U
P
S
M
od
ul
e
2
N
U
P
S
M
od
ul
e
1
N
U
P
S
M
od
ul
e
4
N
U
P
S
M
odul
e
3
U
P
S
M
odul
e
2
U
P
S
M
odul
e
1
U
P
S
M
odul
e
4
St
ri
ng
2
+
St
ri
ng
3
+
St
ri
ng
4
+
St
ri
ng
1
+
PE
1L1
2L1
St
ri
ng
2
N
St
ri
ng
3
N
St
ri
ng
4
N
St
ri
ng
1
N
St
ri
ng
2
St
ri
ng
3
St
ri
ng
4
St
ri
ng
1